恢复己删除数据
一、创建模拟环境

复制代码 代码如下:

SQL> create table hr.xifenfei (id number,name varchar2(20)) tablespace xff;
Table created.
SQL> insert into hr.xifenfei values(1,'xifenfei');
1 row created.
SQL> insert into hr.xifenfei values(2,'xff');
1 row created.
SQL> commit;
Commit complete.
SQL> select * from hr.xifenfei;
ID NAME
———- ——————–
1 xifenfei
2 xff
SQL> select rowid,
2 dbms_rowid.rowid_relative_fno(rowid)rel_fno,
3 dbms_rowid.rowid_block_number(rowid)blockno,
4 dbms_rowid.rowid_row_number(rowid) rowno
5 from hr.xifenfei;
ROWID REL_FNO BLOCKNO ROWNO
—————— ———- ———- ———-
AAAHy3AACAAAAISAAA 2 530 0
AAAHy3AACAAAAISAAB 2 530 1
查询file#，block，后面恢复要用
SQL> delete from hr.xifenfei where id=2;
1 row deleted.
SQL> commit;
Commit complete.
SQL> select * from hr.xifenfei;
ID NAME
———- ——————–
1 xifenfei
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

复制代码 代码如下:

[oracle@localhost ~]$ bbed parfile=/tmp/parfile.cnf
Password:
BBED: Release 2.0.0.0.0 – Limited Production on Mon Aug 22 01:52:52 2011
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
************* !!! For Oracle Internal Use only !!! ***************
BBED> show all
FILE# 2
BLOCK# 1
OFFSET 0
DBA 0×00800001 (8388609 2,1)
FILENAME /opt/oracle/oradata/xifenfei/xff01.dbf
BIFILE bifile.bbd
LISTFILE /tmp/list
BLOCKSIZE 8192
MODE Edit
EDIT Unrecoverable
IBASE Dec
OBASE Dec
WIDTH 80
COUNT 512
LOGFILE log.bbd
SPOOL No
BBED> set dba 2,530
DBA 0×00800212 (8389138 2,530)
BBED> find /c xff
File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
Block: 530 Offsets: 8170 to 8191 Dba:0×00800212
————————————————————————
7866662c 000202c1 02087869 66656e66 65690106 80e2
<32 bytes per line>
BBED> dump /v
File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
Block: 530 Offsets: 8170 to 8191 Dba:0×00800212
——————————————————-
7866662c 000202c1 02087869 66656e66 l xff,……xifenf
65690106 80e2 l ei….
<16 bytes per line>
BBED> dump /v offset 8160
File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
Block: 530 Offsets: 8160 to 8191 Dba:0×00800212
——————————————————-
0000003c 020202c1 03037866 662c0002 l …<......xff,..
02c10208 78696665 6e666569 010680e2 l ....xifenfei....
<16 bytes per line>
BBED> dump /v offset 8164
File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
Block: 530 Offsets: 8164 to 8191 Dba:0×00800212
——————————————————-
020202c1 03037866 662c0002 02c10208 l ……xff,……
78696665 6e666569 010680e2 l xifenfei….
<16 bytes per line>
BBED> dump /v offset 8162
File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
Block: 530 Offsets: 8162 to 8191 Dba:0×00800212
——————————————————-
003c0202 02c10303 7866662c 000202c1 l .<......xff,....
02087869 66656e66 65690106 80e2 l ..xifenfei....
<16 bytes per line>
BBED> dump /v offset 8163
File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
Block: 530 Offsets: 8163 to 8191 Dba:0×00800212
——————————————————-
3c020202 c1030378 66662c00 0202c102 l <......xff,.....
08786966 656e6665 69010680 e2 l .xifenfei....
<16 bytes per line>
通过尝试，推断出来3c的offset
BBED> modify /x 2c
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
Block: 530 Offsets: 8163 to 8191 Dba:0×00800212
————————————————————————
2c020202 c1030378 66662c00 0202c102 08786966 656e6665 69010680 e2
<32 bytes per line>
修改3c为2c
BBED> sum apply
Check value for File 2, Block 530:
current = 0xb1b9, required = 0xb1b9

复制代码 代码如下:

SQL> startup
ORACLE instance started.
Total System Global Area 236000356 bytes
Fixed Size 451684 bytes
Variable Size 201326592 bytes
Database Buffers 33554432 bytes
Redo Buffers 667648 bytes
Database mounted.
Database opened.
SQL> select * from hr.xifenfei;
ID NAME
———- ——————–
1 xifenfei
2 xff

复制代码 代码如下:

SQL> create table t_xifenfei(id number,name varchar2(10));

Table created.

SQL> insert into t_xifenfei values(1,'xifenfei');

1 row created.

SQL> insert into t_xifenfei values(2,'XIFENFEI');

1 row created.

SQL> commit;

Commit complete.
dump数据块
SQL> alter system flush BUFFER_CACHE;

System altered.

SQL> select rowid,id,name,
2 dbms_rowid.rowid_relative_fno(rowid)rel_fno,
3 dbms_rowid.rowid_block_number(rowid)blockno,
4 dbms_rowid.rowid_row_number(rowid) rowno
5 from chf.t_xifenfei;

ROWID ID NAME REL_FNO BLOCKNO ROWNO
------------------ ---------- ---------- ---------- ---------- ----------
AAASdmAAEAAAACvAAA 1 xifenfei 4 175 0
AAASdmAAEAAAACvAAB 2 XIFENFEI 4 175 1

SQL> alter system dump datafile 4 block 175;

System altered.
dump文件内容
block_row_dump:
tab 0, row 0, @0x1f89
tl: 15 fb: --H-FL-- lb: 0x1 cc: 2
col 0: [ 2] c1 02
col 1: [ 8] 78 69 66 65 6e 66 65 69
tab 0, row 1, @0x1f7a
tl: 15 fb: --H-FL-- lb: 0x1 cc: 2
col 0: [ 2] c1 03
col 1: [ 8] 58 49 46 45 4e 46 45 49
end_of_block_dump
2012-05-01 05:09:29.287714 : kjbmbassert [0xaf.4]
End dump data blocks tsn: 4 file#: 4 minblk 175 maxblk 175

复制代码 代码如下: